Inside caliper



J. W. PARKER INSIDE CAMPER Jan. 13, 1931.

Filed March 2e, 1928 mn: ....v

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Patented Jan. 13, 1931 Y UNITED STATES 'JOHN W. PARKER,- oF WEST ImImINe'IoN,i RHQDE ISLAND, AssIG'Non To'BnowN &

`PATE NI oifFIcE'.

SHARPE MANUFACTURING coMPANv, on rItovInnNcE,Y RIIODNISLAND, A coRPonA- i TION OF RHODE ISLANDV INSIDE CALIPER Application led March 26, 192,8; Serial No. 264,599.

ablemembers one from the 'other when the handle is disengaged from the head.

A further object of the inventionis the provision of an inside caliper formed of a cross head having tubular telescoping parts with a spring housed Within these parts for pressing them toward extended position also providing a collar on the'outer tube to which a handle is detachablyconnected and having a binding pin in the handle arranged to bind the head parts in different adjusted positions.

With these and other objects in view, the

invention consistsof certain novelfeatures K In the accompa of construction, as will be more fully described, andparticularly pointed out in the appended claims.v l

nying drawings'f Fig. 1 isa side elevation villustratingY improved construction of, caliper.

Fig. 2 is a sectional view ofthe caliper'.l Y Fig. 3V is an enlarged view showing" the construction of the 'telescoping measuring head and the meansfor limiting the extending stroke'of the movable member independent of the binding action of the handle. n

Fig. 4 shows the inner tubular telescoping member as provided with a longitudinal groove With end Walls. n l

Fig. 5 is a modification illustrating ya stop pinformed'in the' outer` tube and extending into the groove inthe inner tube to serve as a stop'to limit the extending acti-on of the extension member.

It is found in the practical construction and operation of inside calipers of the cross head ltypegof advantage to provide means whereby the telescopingfparts of the cross head will not be completely separated when the operating handle is removed from the cross head as it is found in practice of advantage to so construct thel caliper that the handle may be removed both-forconvenience member 12 for storage and shipment and also so that the f handle may be usedon measuring heads of other sizes thereby eliminating the necessity of forming a handle for each and every head of a set; and to accomplish this in a simple and effective Way, I have provided a cross head having telescoping. tubular members pressedtoward extended-position by a spring -inclosed in the tubes, and to the outer tube I have applied a collar to which an operating handle is removably attached and I have also provided a simple stop member in-dependent of the handle Which extends into a groove in the inner tube having end Walls lwhereby this stop is arranged to operate independently of theretaining means in the handle permitting the handle to be completely removed to reduce the storingspace and also permitting a single handle to be used on rany of the dilferentsized 'heads of a set; and

the'following isa'detailed description of the present embodiment ofv my invention and vshowing one means `byivvhich these advantageous results may be accomplished. v

With reference to the dravvings,-10 desigynates the outer tube ofthe cross head which is closed at one end as at 11. Near the opposite end of this tube? is secured a collar preferably by being lforced thereon. f`

This collar is also preferably provided with a threaded stem 13 on to Which the tubular handle 14 is screwed. Slidably mounted Within this outer tube is an inner telescoping tube'rl lalso closed at its outer end as at 167 andprovided on its outer surface With a longitudinally disposed posite end. Walls 18. Within these inner and outer tubes is mounted a coil spring 19in-one end of Which is mounted the guide-'pin 2O having a head 21 at one end resting against the `closed end 11 ofthe tube 10 and extending up inside of the spring to assist in retaining it in axial alignment With the inner tube. This spring operates Within these inner and outer tubes to lpress them relatively `toward extended position.

In Order to' limit the outward motion of this inner tube Within the outer tube, I have groove 17 having -opprovided a set screw 22 which is threaded into the collar member to bind against the 'outer tube, the screw being also provided with a. reduced portion 23 which extends thru the outer tube into the groove 17 to engage the end wall 18 of the inner tube yand so limit the In some instances instead of'using the Vscrew 22 I may employ a separate pin 8O toserve as a stop for the inner tube.

The operating handle 14 is preferably of tubular construction and is threaded internally at its inner' end as at 24 to screw onto the stem 13 of the head member 12 and this tubular handleis also internally threaded at its outer end as at 25 for the reception of the adjustable plug 26 which is threaded therein. Within this tubular handle, AI mount a binding pin 27 one end of which extends loosely' into the bore in the plug; 26 Lwhile its opposite end 28 extends thru the stem 13 and the wall of the outer tube 10 into engagement with the inner tubular extension member V15, whereby when the handle'porti'on .290i the plug 26 is rotated to screw it inwardly this'pin 27 is caused to bindt-he inner tube 15 andl retain it in the desired adjusted position and when rotated and. screwed outwardly it releases this pin to permit a free relative endways movement of the inner tube 15.

My improved construction of' inside caliper may be manufactured at alow cost and by the use of a stop member-which is independent of the handle and its binding action,

I am enabled to remove the handle from the measuring head to reduce Vto the minimum the space required Jfor storing and or'shipmentand also to permit thissingle handle'to be used on any one of a setV of heads of different sizes without the necessity of having Va handle for each head. s

The foregoing description is directed'solely towards the construction illustrated, but I desire it to be understood that I reserve the privilege of resortingto all the mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims.

I claim:

1. An inside caliper comprising a measuring cross head formed of a. plurality of tubular members one being slidable within the other, a spring within the tubes pressing them toward extended position, a handle detachably connected to one of said members, means in the handle for retaining said members in adjusted position, and means independent of the retaining means in the handle for limiting the extending motion of the tubes. Y

2. An inside caliper comprising a measuring cross head formed of tubes slidable one within the other, a spring in the tubes pressing them toward extended position, a collar o n the outer tube having a threaded stem por- Y tion, a tubular handle threaded onto the stem',

a binder pin in the handle, a member adjustably mounted at the outer end of the'handle for causing said pin to'bind the slidable tubes in adjusted position, and a stop member 'in said collar extending into engage.- ment with one of said slidable .'tubesarranged to prevent completeseparation of connected to the stem', a binder .pin extend-` ing substantiallyfthe lengthv of the handle,. a

member adjustablyjmounted atl the outer endof the handle for vcausing `saidfpin to bind the head-parts in adjustedposition, said inner tubehaving a longitudinal groove with ing thru the outer tube intoV said groove in the inner tube to prevent completeseparation of the .tubes whenthe handle has. been disconnectedfrom the head.

end walls, anda screw in the collar extend-Ak 4. An insidecaliper comprising a measur.-

ing cross head formed of two tubular members, one slidable within the other, a` spring in the tubes pressingthem toward Vextended position, a collar iixedto the outer tube-.hav-

ing a threaded stemportion, a tubularhandle v threaded onto thev stem, an elongated binder pin in the handle, aplugthreaded into the outer end of the handle arrangedfto cause said pin to bind. said tubular .members in adjust- .handle is. removed. f

Y 5. In an inside caliper, an extendible. meas- 4 105 ed posi-tion, and av stop member independent uring cross-head` including two tubular mem-bers slidable one within the other, an operating handle detachably connected to said cross-head, means movable in said handle and engageablewith the inner member.I

to releasably retain said. members in different adjusted ositions, and cooperating stops on said members limiting the relative movement of said members. to prevent complete separation when the handle with the retaining. means therein is detached 4trom said crosshead.

6. In an inside caliper, an extendible measuring cross-head including two tubular members slidable one withinthe otherl and a collar on the outer tube, an operating handle detachably connected to said collar,'meansmov able in said handle and engageable with the inner member to releasably retain said. in-

ner member in dierent adjusted positions 1,30

, atively extended position, a handle connected to said cross-head, means in the handle movable toV retain the members in adjusted relative position, and stop means in said crosshead independent of the retaining means for limiting the relative extension of said memers.

8. In an inside caliper, a measuring crosshead having a plurality oA relatively slidable members one Within the other and spring 'means yieldingly urging the members to relatively extended position, a handle detachably connected to said cross-head, means in the'handle movable to retain the members in adjusted relative position, and stop means in said cross-head independent of the retaining means for limiting the relative extension of said members upon detachment of said handle and the retaining means therein from said cross-head.

In testimony whereof I aix my signature.

JOHN W. PARKER. 

